through bottles containing water at

through bottles containing water at the incubator temperature.
The air exiting the vessels was passed through flasks in a separate
water bath set at 9 C to condense moisture from the off-gas. The
off-gas was then analyzed for percent CO2 using an infrared gas
analyzer (Vaisala model GMT 220, range 0e20%). CO2 data was
automatically recorded using a Campbell Scientific model 23XL
data logger for each vessel every hour. Each vessel was also
equipped with a K-type thermocouple to measure the temperatures
of the composts mix near the center of the compost vessel,
and was recorded automatically every 12 min. A more complete
description of the laboratory-scale composting system can be
found elsewhere [27].